tia-teamcenter

# TIA Portal Teamcenter Gateway ## Scope Teamcenter Gateway workflows exposed by `Siemens.Engineering.TeamcenterGateway`. The V21 API is provider-based: connection, lock, search/download, and workflow operations are separate services. ## Reference files Load ONLY the reference file(s) relevant to the task. | Reference file | Load when the task involves | |---|---| | `references/workflows-and-safety.md` | Provider acquisition, credentials, connection ownership, search/download, checkout/check-in, save workflows, cache overwrite, and remote-write safety. | | `references/v21-api-surface.md` | Complete installed V21 `Siemens.Engineering.TeamcenterGateway` type and member surface. | ## Installed V21 entry points Portal-scoped providers: ```csharp TeamcenterConnectionProvider connections = tiaPortal.GetService<TeamcenterConnectionProvider>(); TcGatewayLockProvider locks = tiaPortal.GetService<TcGatewayLockProvider>(); TcGatewaySearchAndDownloadProvider searchAndDownload = tiaPortal.GetService<TcGatewaySearchAndDownloadProvider>(); ``` The save provider belongs to the opened project or global library: ```csharp TcGatewayWorkflowProvider workflow = project.GetService<TcGatewayWorkflowProvider>(); ``` Do not introduce an intermediate service or storage composition that is absent from these installed entry points. ## Enforcement 1. Require the exact endpoint, Teamcenter instance, user/group/role or SSO application identity, and expected item/revision/datase...